I just can't wrap my head around tiling WMs (and I've been doing Linux since a _long_ time ago). I just don't see how usable they can be when you have a "small" screen to be honest.
If you want to maximize all windows on run, niri can do that with a rule. It then becomes like a monocle layout where you can use swipes/keyboard/scroll wheel to navigate between maximized windows. I don't know of any DE that will run all windows maximized by default.
Too bad I no longer have an 800x600 netbook. Niri would be perfect for it.